<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <input class="input" type="text" onblur="check()" >
    <script>
        
       function check(){
        var input = document.querySelector('.input')
        var tel = input.value;
        var reg = new RegExp(/1[3,4,5,6,7,8,9]\d{9}/);
        var isOk = reg.test(tel); 
        console.log(isOk);
       }
    </script>
</body>
</html>